You can go to QuickLaunch

$8 / user / year

Problem gets resolved at approximately 11% of what you would pay to MicrosoftTM annually.

Currently, this service and the blacklisting needs to be manually configured and maintained by QuickLaunch.

Note: This means that even after enabling QuickLaunch Shield, if there is an attack from a new indirect IP that isn’t on the QuickLaunch Shield global blacklist policy already, you may still experience the symptoms and be required to create a support case to allow for QuickLaunch to update its policies

This will be automated with SmartShield, which has a release date of April 30th, 2019 and will be a no-cost upgrade

We can’t comment on why MicrosoftTM doesn’t include this service as part of its O365TM subscription, especially, considering these are direct denial-of-service-(DDOS) attacks on their IMAP protocol service.

With regards to QuickLaunch, if you are a Verify SSO customer, we have built-in DDOS detection and prevention for direct attempts and attacks to our services. However, in this case, these attempts are all indirect and through a legitimate direct source – which is MicrosoftTM – which is why our built-in DDOS services do not detect and prevent the malicious login attempts. Although, we would love to provide this solution at no additional cost to our customers, we have to invest in infrastructure and resources to develop, maintain and continue to enhance a solution that not only detects and prevents such attacks, but continues to do so automatically, intelligently, and across other services that extend beyond O365TM for a truly robust solution.

They can be; however, if you are using QuickLaunch Adaptive Multi-Factor Authentication, all your application’s web/thin clients are protected through 2-factor verification. We recommend enabling Adaptive Multi-Factor Authentication if you haven’t done so already. Go you our pricing page for a quote.